Answer:
Area of one tile (parallelogram shape) = base × height = 3 × 4.5 \[=13.5\text{ }c{{m}^{2}}\] Area of such 2760 tiles = 2760 × \[=13.5\text{ }c{{m}^{2}}\] \[=37,260\text{ }c{{m}^{2}}\] \[=3.726\text{ }{{m}^{2}}\] Cost of polishing = 3.726 × 20 = Rs 74.52.
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